JPH1199776A - Information recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To raise the number of printing times, and also raise resistances such as water resistance and chemical resistance by providing a transparent plastic film having a specific thickness on the outer layer surface of a thermal recording layer placed on the carrier of a plastic sheet. SOLUTION: A heat resistance skid material layer 5 for lessening frictional force between the thermal head and the plastic film 1 during printing and erasing operation by a thermal head is provided by a printing method, a coating method, or the like on the upper layer of a transparent plastic film having a thickness of 1-10 μm being a protection film of the thermal recording layer 2, and a color layer 3 is formed at the inside of the thermal recording layer 2 for improving the contrast of printed images by a method of printing, coating, vacuum depositing, etc., in addition, an adhesive 4 is applied for an integration with a card carrier 7 by a method of printing, coating, or the like. The number of iteration can be raised more than in conventional one, and resistances such as water resistance and chemical resistance can also be raised by making the use of the contrast of a polymer/low molecular type and leuco compound type.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a membership card, an ID,
The present invention relates to an information recording medium such as a card, a credit card, a cash card, an IC card, and a prepaid card.
The present invention relates to an information recording medium having the visible information section.

[0002]

2. Description of the Related Art Conventionally, members made of vinyl chloride resin or polyester resin are mainly used for membership cards, ID cards, credit cards, cash cards, IC cards, prepaid cards and the like. As an information recording method of these cards, a magnetic tape, a magnetic recording layer or an IC chip capable of magnetic recording is provided on a part of the card, and information is recorded by digital or analog signals.

When displaying or confirming the information storage contents of these cards, it is necessary to read the stored information with a dedicated reader, and there is no means for a general user to confirm. Also, as a special use method, when a member uses this card according to a certain rule, a premium, points, etc. may be given to the member, but in this case, the premium is added to the card. ,
The points and the like need to be magnetically recorded, for example, and separately introduced in a guide letter or the like.

[0004] In recent years, there has been an increasing demand for simply displaying the information storage contents of cards.
There is a growing demand for displaying premiums, points, and the like on cards. In order to satisfy this requirement, a polymer / low-molecular type that disperses organic low molecules in a resin binder to perform reversible display by opacity and transparent contrast, and a leuco compound and a color-reducing agent corresponding thereto are dispersed in a resin binder. A leuco compound type that performs reversible display with contrast due to color development or color reduction, or a magnetic microcapsule in which a magnetic substance is encapsulated in a microcapsule;
Alternatively, a magnetic microcapsule type, which adheres to the back surface with an adhesive or the like and performs reversible display with contrast when the angle of the magnetic body is changed, has been developed.

However, the former polymer / low-molecular type and the leuco compound type perform printing with a thermal head directly on the reversible recording layer or through the protective layer, so that even if the resistance of the protective layer can be improved, the reversible type is used. The damage to the recording layer is large, and the number of times of printing is about several tens to several hundreds. Further, the leuco compound type is easily affected by moisture in the air, and has a phenomenon of fading spontaneously in an environment of high humidity. On the other hand, the magnetic microcapsule type uses a magnetic head at the time of printing, so that damage to the reversible recording layer is small and the number of times of printing can be 10,000 or more.
Since the magnetic material of the magnetic microcapsule has a dark color tone close to a metallic color or black, there is a possibility that the contrast or the design property may be impaired.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and takes advantage of the contrast of the high molecular weight / low molecular weight type or the leuco compound type to reduce the number of times of printing. An object of the present invention is to provide an information recording medium which is improved in water resistance, chemical resistance and the like, while improving the resistance.

[0007]

Means for Solving the Problems The present invention has been made to achieve the above object, and the invention according to claim 1 has the following features.
In a card having a heat-sensitive recording layer provided on a plastic sheet support, the thickness of the heat-sensitive recording layer is 1 to 1 on the outer layer surface.
An information recording medium provided with a 10 μm transparent plastic film.

According to a second aspect of the present invention, in the information recording medium according to the first aspect, a reversible thermosensitive recording material is contained in a resin base material of a thermosensitive recording layer provided on a support of a plastic sheet. Are dispersed to form a reversible thermosensitive recording layer.

According to a third aspect of the present invention, there is provided the information recording medium according to the first or second aspect, wherein the thickness of the information recording medium is 1-10.
A heat-sensitive recording layer was provided on a transparent plastic film having a thickness of 100 to 1000 μm.
Wherein a heat-sensitive recording layer is provided on a plastic sheet support.

According to a fourth aspect of the present invention, in the information recording medium according to the first, second or third aspect, an inorganic vapor-deposited thin film layer is provided on at least one surface of a transparent plastic film on the outer layer surface. Features.

According to a fifth aspect of the present invention, in the information recording medium of the first, second, third or fourth aspect, the outermost layer of the transparent plastic film on the outer layer has heat resistance and slipperiness. It is characterized in that the applied resin layer is provided.

According to a sixth aspect of the present invention, in the information recording medium according to the first, second, third, fourth, or fifth aspect,
The reversible thermosensitive recording material provided in the thermosensitive recording layer is composed of a resin base material and organic low molecules dispersed therein, and further provided with a coloring layer for improving the contrast of the printed portion, and a thicker adhesive layer. It is characterized in that it is laminated on a plastic sheet support having a thickness of 100 to 1000 μm.

According to a seventh aspect of the present invention, in the information recording medium according to the first, second, third, fourth or fifth aspect,
The reversible thermosensitive recording material provided in the thermosensitive recording layer is composed of a reversible thermochromic composition of a leuco compound and a color-reducing agent and a binder, and a plastic sheet having a thickness of 100 to 1000 μm is formed by an adhesive layer. Characterized in that they are laminated on a support.

According to an eighth aspect of the present invention, there is provided the information recording medium according to the first, second, third, fourth, fifth, sixth, or seventh aspect for managing image data recorded on the heat-sensitive recording layer. In the same card.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION The information recording medium of the present invention is a card having a reversible recording layer provided on the front or back surface of a support over the entire surface or a partial area without impairing the reversible recording characteristics.
In addition, the reversible recording layer can realize an unprecedented improvement in the number of repeated printings by using a film having high flexibility and high tensile strength as a protective film. Furthermore, since the protective film has excellent gas barrier properties, it has water resistance and water resistance. This is an information recording medium with improved resistance such as chemical properties. Further, in order to manage image data recorded on the heat-sensitive recording layer of the information recording medium, a magnetic recording layer or an IC
By holding an information recording medium such as a chip in the same card, even if the image data or the information recording data disappears, an information recording medium that can be easily reissued can be obtained.

Further, embodiments will be described in detail with reference to the drawings.

FIG. 1 is a sectional view of an information recording medium according to an embodiment of the present invention, showing a basic configuration of the present invention. As shown in the figure, a plastic film 1, which is a protective film for a heat-sensitive recording layer, contains a resin base material and a reversible thermosensitive recording material dispersed in the resin base material as main components, and depends on temperature. The basic configuration of the present invention in which a heat-sensitive recording layer 2 whose contrast is reversibly changed is provided by a printing method, a coating method, or the like, and is integrated with a card support 7 of a plastic sheet.

FIG. 2 is a sectional view of an information recording medium according to another embodiment of the present invention, showing one configuration of the present invention. As shown in the figure, a heat-resistant slide is formed on the plastic film 1 as a protective film of the heat-sensitive recording layer 2 in order to reduce the frictional force between the thermal head and the plastic film 1 when printing and erasing with the thermal head. The material layer 5 is provided by a printing method, a coating method, or the like, and the coloring layer 3 is formed by a printing method, a coating method, a vacuum deposition method, or the like in order to improve the contrast of an image printed inside the heat-sensitive recording layer 2. One configuration of the present invention in which an adhesive 4 is provided by a printing method, a coating method, or the like for providing the adhesive 4 and for integrating with the card support 7 is shown.

FIG. 3 is a sectional view of an information recording medium according to another embodiment of the present invention, showing one configuration of the present invention. As shown in the figure, an inorganic vapor-deposited thin film layer 6 is provided on one surface of a plastic film 1 serving as a protective film of the heat-sensitive recording layer 2 by a vacuum vapor deposition method, a sputtering method, or the like. In order to reduce the frictional force between the thermal head and the plastic film 1 at the time of printing / erasing with the thermal head on the outermost layer surface, a heat-resistant lubricating layer 5 is provided by a printing method, a coating method or the like. On the inner side, a coloring layer 3 is provided by a printing method, a coating method, a vacuum deposition method, or the like in order to improve the contrast of an image printed in the heat-sensitive recording layer 2, and further, an adhesive is used to integrate with the card support 7. 4 shows one configuration of the present invention provided by printing method, coating method and the like.

FIG. 4 is a sectional view of an information recording medium according to another embodiment of the present invention, showing one configuration of the present invention. As shown in the drawing, the plastic film 1 has a resin base material and a reversible thermosensitive recording material dispersed in the resin base material as main components, and has a thermosensitive property in which the contrast reversibly changes depending on the temperature. An information recording section 8 is provided on an information recording medium integrated with a reversible thermosensitive recording member having the configuration shown in FIG.
Shows a basic configuration of the present invention in which is provided by a predetermined method.

In FIG. 1 to FIG. 4, a plastic film 1 which is a protective film of the heat-sensitive recording layer 2 is transparent to improve recognition of image data recorded on the heat-sensitive recording layer. In order to print image data, a plastic film excellent in heat resistance, which can sufficiently conduct heat from the thermal head, can be applied. For example, films such as a polyethylene terephthalate film (PET film), a polyethylene naphthalate film (PEN film), a polyimide film, and a polyphenylene sulfide film (PPS film) can be used. If these films are transparent, the color tone is not particularly limited, and the thickness is selected from the range of 1 to 10 μm in consideration of heat conductivity and physical characteristics, and preferably about 1.0 to 5.0 μm. Any thickness is acceptable.

The heat-sensitive recording layer 2 is composed of a polymer / low-molecular type in which cloudiness and transparency are reversibly changed by a change in the crystal state of an organic low-molecular substance dispersed in a matrix of a resin matrix. Selecting and using any of the leuco compound types, which are thermochromic compositions utilizing a reversible / irreversible color forming reaction between an electron-donating color-forming compound and an electron-accepting compound dispersed in can do.

First, the high molecular weight / low molecular weight type is one in which the cloudiness and transparency change reversibly due to the change in the crystalline state of the organic low molecular weight substance dispersed in the matrix of the resin matrix. 4 to 20 μm
Degree can be provided. Examples of the organic low-molecular substance dispersed in the heat-sensitive recording layer include a fatty acid or a fatty acid derivative or an alicyclic organic acid, and more specifically, a saturated or unsaturated substance or a dicarboxylic acid, or an ester thereof, A material containing an amide or the like is used, but is not particularly limited. Specific examples of the saturated fatty acids include undecanoic acid, lauric acid, myristic acid, pentadecanoic acid, palmitic acid, heptadecanoic acid, stearic acid, nanodecanoic acid, arachinic acid, behenic acid, lignoceric acid, serotinic acid, montanic acid, and melicic acid. And specific examples of unsaturated fatty acids include oleic acid, elaidic acid, linoleic acid, sorbic acid, stearolic acid and the like. The fatty acid, fatty acid derivative or alicyclic organic acid is not limited to these, and one or more of these can be used as a mixture. Further, as the resin base material to be used, an acrylic resin, a urethane resin, a polyester resin, a cellulose acetate resin, a nitrocellulose resin, a PVC resin, a vinyl acetate resin alone, mixed or mixed A polymer is used. On the other hand, in order to control the clearing temperature range of the reversible thermosensitive recording section, a plasticizer of a resin, a high boiling point solvent and the like are used in an amount of 0.1 to 20 with respect to the resin base material.
% By weight. Further, in order to improve the repetitive print erasure resistance of the reversible thermosensitive recording section, a curing agent for three-dimensionally crosslinking corresponding to the resin base material, a crosslinking agent, etc. are added to the resin base material in an amount of 0.5 to 10% by weight. be able to.

Next, the leuco compound type is a thermochromic composition utilizing a reversible color reaction between a leuco compound dispersed in a matrix of a resin matrix and a color-developing agent, and is formed by a printing method, a coating method, or the like. The thickness can be set to about 4 to 20 μm. Examples of the usually colorless to light-colored leuco compound used in the heat-sensitive recording layer include those generally used in pressure-sensitive recording paper, heat-sensitive recording paper, photosensitive pressure-sensitive paper, energized heat-sensitive recording paper, heat-sensitive transfer paper, and the like. , Lactone, sultone, xanthene having a partial skeleton such as spiropyran,
Spiropyran, lactone, fluoran, sultone and the like are used, but are not particularly limited. As a specific example, 3,3-bis (p-dimethylaminophenyl)
-6-dimethylaminophthalide, 3,3-bis (p-dimethylaminophenyl) phthalide, 3,3-bis (1,
2-dimethylindol-3-yl) -6-dimethylaminophthalide, 3-dimethylamino-6-chloro-7-
Methylfluoran, 3,3-bis (9-ethylcarbazol-3-yl-5-dimethylaminophthalide, 3-dimethylamino-7-dibenzylaminofluoran, 3-
Diethylamino-7-chlorofluoran, 3-diethylamino-6-methyl-7-anilinofluoran, 3-piperidino-6-methyl-7-anilinofluoran, 3-
(N-ethyl-n-tolyl) amino-6-methyl-7-anilinofluoran, 3-dibutylamino-6-methyl-
7-anilinofluoran, 3- (n-ethyl-n-isoamyl) amino-6-methyl-7-anilinofluoran, 3- (n-ethyl-n-tetrahydrofuryl) amino-6-methyl-7 -Anilinofluoran, etc., which are used alone or in combination.

On the other hand, the color-developing agent is a compound having both a color-developing effect and a color-reducing effect on a leuco compound by reversibly releasing protons under the action of thermal energy. That is,
It has both an acidic group consisting of a phenolic hydroxyl group or a carboxyl group and a basic group consisting of an amino group, and becomes acidic or basic due to a difference in heat energy to cause the leuco compound to develop or decolor. The basic group may be present as a functional group or may be present as a part of a compound. Further, by using a color-developing agent having either a functional group of an acidic group or a basic group of the color-developing agent, only a color-forming effect can be exhibited. Examples of the color-reducing agent having an acidic group and a basic group as functional groups include aminobenzoic acids, hydroxyaminobenzoic acids, aminophenols, aminonaphthoic acids, and nicotinic acids. Specific examples include m-aminobenzoic acid, o
-Aminobenzoic acid, 4-amino-3-methylbenzoic acid,
3-amino-4-methylbenzoic acid, 2-amino-5-ethylbenzoic acid, 3-amino-4-butylbenzoic acid, 4-
Amino-3-methoxybenzoic acid, 3-amino-4-ethoxybenzoic acid, 2-amino-5-chlorobenzoic acid, 4-
Amino-3-bromobenzoic acid, 2-amino-2-nitrobenzoic acid, 4-amino-3-nitrobenzoic acid, 3-amino-4-nitrilebenzoic acid, aminosalicylic acid, diaminobenzoic acid, 2-methyl-5 -Aminonaphthoic acid, 3-
Ethyl-4-aminnaphthoic acid, nicotinic acid, isonicotinic acid, 2-methylnicotinic acid, 6-chloronicotinic acid and the like. Further, those having a basic group as a part of the salt compound include salts or complex salts of a compound having a phenolic hydroxyl group or a carboxyl group and a compound having an amino group, such as hydroxybenzoic acids, hydroxysalicylic acids, and gallic. Salts or complex salts of acids such as acids and bisphenolacetic acid with bases such as aliphatic amines, phenylalkylamines and triallylalkylamines are exemplified. Specific examples thereof include p-hydroxybenzoic acid-alkylamine salt, p-hydroxybenzoic acid-phenylalkylamine salt, m-hydroxybenzoic acid-alkylamine salt, 2,4-dihydroxy-alkylamine salt, 4,5 -Dihydroxybenzoic acid-trialkylamine salt, 4,5-dihydroxybenzoic acid-tolylalkylamine salt, p-hydroxybenzoic acid methyl-alkylamine salt, p-hydroxybenzoic acid stearyl-alkylamine salt, gallic acid-alkylamine Salt, stearyl gallic acid-alkylamine salt, bisphenolacetic acid-alkylamine, bisphenolacetic acid octyl-alkylamine salt and the like are used alone or in combination.

It should be noted that the leuco compound and the color reducing agent are not limited to these, and one or more of these may be used as a mixture. Further, as the resin base material used, acrylic resin, polyester resin, polyurethane resin, polyurea, melamine, polycarbonate, polyamide, polyvinylpyrrolidone, polyvinyl alcohol,
Resins such as polyvinyl chloride and polyvinyl butyral may be used alone, mixed or copolymerized. Further, in order to improve the repetitive print erasure resistance of the reversible thermosensitive recording section, a curing agent for crosslinking three-dimensionally corresponding to the resin base material, a crosslinking agent, etc. are added to the resin base material in an amount of 0.5 to 10% by weight. be able to. Further, an ultraviolet absorber having relatively high compatibility with the leuco compound can be added to improve the resistance.

The coloring layer 3 can be provided as needed in order to improve the contrast between the printed portion and the non-printed portion of the image data of the heat-sensitive recording layer 2. In addition, the colored layer 3 has a heat insulating effect in addition to improving the contrast between the printed portion and the non-printed portion, so that a configuration excellent in low-energy print coloring can be obtained. The coloring layer 3 can be provided with an ink obtained by dispersing and dissolving a coloring pigment, a dye and the like in a polymer material to a thickness of about 0.5 to 5 μm by a printing method or a coating method. As the polymer material, polyvinyl chloride, polyvinyl chloride-vinyl acetate copolymer, polyester resin, polyethylene resin, acrylic resin, or the like is used alone or in combination. Preferably, polyvinyl chloride, polyvinyl chloride, or the like is used. Vinyl vinyl acetate copolymers and polyester resins are used. The coloring layer 3 is formed by a vacuum deposition method, a sputtering method, an ion plating method, a lamination method or the like in addition to the printing method and the coating method, and has a thickness of 0.03 to less than 0.03 by the vacuum deposition method, the sputtering method, and the ion plating method. The thickness can be set to about 0.08 μm and about 0.5 to 2 μm by a lamination method. Materials that can be applied by the thin film forming method include, for example, Al, Cr,
Sn, Ni, Cu or the like is used. Furthermore, the color tone can be adjusted by using the materials used in combination.

The adhesive 4 is used to integrate a reversible thermosensitive recording section provided with the thermosensitive recording layer 2 on the plastic film 1 obtained above on a card support 7. The adhesive 4 is provided by applying a polymer material having a softening point of 150 ° C. or lower to a thickness of 0.5 to 10 μm by a printing method or a coating method. As the polymer material, polyvinyl chloride, polyvinyl acetate, polyester-based resin, polyethylene-based resin, polyurethane-based resin, acrylic-based resin alone, mixed or copolymerized is used. Preferably, polyvinyl chloride, polyurethane resin, or polyester resin is used.

The heat-resistant lubricating layer 5 is a layer that reduces the coefficient of friction of the plastic film 1 and serves to protect the lower layer. The thickness can be set to about 2 to 5 μm. As the resin used, for example, acrylic resin, urethane resin, vinyl chloride resin-vinyl acetate copolymer resin, polyester resin, melamine resin, epoxy resin, polystyrene resin, conventionally known resin such as polyimide resin A thermoplastic resin, a thermosetting resin, an ultraviolet or electron beam curable resin is used alone or as a mixture.
Further, a hardening agent that crosslinks the resin to improve the resistance and prevent sticking, polyethylene wax, carnauba wax, waxes such as silicone wax, or extender pigments such as calcium carbonate, zinc stearate, silica, alumina, talc, Fats and oils such as silicone fats and oils can be added as long as the transparency is not impaired. When printing or erasing with a thermal head, a hollow filler, beads or the like can be added to the extent that transparency is not impaired in order to control heat conductivity.

The inorganic vapor-deposited thin film layer 6 is provided on any one surface of the plastic film 1 to improve the resistance of the reversible thermosensitive recording section provided with the thermosensitive recording layer 2 on the plastic film 1 obtained above. Can be. The inorganic vapor-deposited thin film layer 6 is a constituent layer that imparts a water vapor barrier property and a gas barrier property, and is formed by a vacuum vapor deposition method, a sputtering method, an ion plating method, or the like.
The film thickness can be set to about 0.03 to 0.08 μm by a plating method or the like. As a material that can be applied by the thin film forming method, for example, a transparent vapor deposition material such as Ti
O ₂ , ZnS, ZnO, WO ₃ , SiO, Si ₂ O ₃ , Zr
O ₂ , Ta ₂ O ₃ , Al ₂ O _{3 and the} like are used, but not limited thereto.

The card support 7 is made of various plastic materials, and is used by bonding two or more layers as necessary. For example, materials such as polyvinyl chloride resin, polyester resin such as polyethylene terephthalate, polyolefin resin such as polyethylene and polypropylene, polycarbonate resin, and ABS resin can be used. The thickness is selected from a range of about 100 to 1000 μm,
Preferably, the thickness of the card is around 180 to 800 μm.

The information recording section 8 is a section for recording and holding data such as personal information, and is provided with a recording medium such as a magnetic recording layer and an IC chip. The magnetic recording layer is provided on the entire surface or a part of the card by a printing method, a coating method, or the like, or a magnetic recording layer processed into a tape shape is applied by transfer or the like, and is made flush with the card by a normal heat lamination method or the like. . When a contact type IC chip is provided,
A part of the base material that has been made into a card in advance is cut off, and an IC chip is adhered to a portion having a depression with an adhesive or the like. On the other hand, when a non-contact type IC chip is provided, the non-contact type IC chip is embedded in the card support 7 in advance.

As a method of integrating the reversible thermosensitive recording section obtained above and the card support 7 into a card form, there are a hot roll method, a hot press method, a heat lamination method, an extrusion method,
An injection molding method or the like can be used.

[0034]

Embodiments of the present invention will be described below in detail.

Example 1 Transparent PEN having a thickness of 3.0 μm
A heat-sensitive recording coating composed of a low-molecular organic compound dispersed in a resin base material was applied to a plastic film 1 composed of a film at a drying temperature of 130 ° C. and a coating thickness of 9 μm using a gravure method. An Al layer having a thickness of 0.05 μm was provided as a colored layer on the upper layer by using a vacuum evaporation method. Further, an adhesive paint is applied to the upper layer using a gravure method at a drying temperature of 100 ° C.
The coating was applied to a coating thickness of 2 μm to obtain a reversible thermosensitive recording section. The reversible thermosensitive recording section was placed on a back side of the magnetic recording layer surface of a card support 7 made of white PET having a thickness of 180 μm and provided with a magnetic recording layer on one side by a hot roll method at a roll temperature of 1 °
An information recording medium was obtained by integrating under the conditions of 80 ° C. and a conveying speed of 50 mm / s.

The obtained information recording medium can be printed with an applied energy of 0.4 mJ / dot using a thermal head, and further, the print data is erased with an applied energy of 0.2 mJ / dot using a thermal head. did it. Further, the number of times of repetitive printing was 100 or more, and an information recording medium having high practicality was obtained. The paints used for card production are shown below. <Heat-sensitive recording layer coating> Stearic acid 7 parts by weight Sebacic acid 2 parts by weight Vinyl chloride-vinyl chloride copolymer resin 6 parts by weight Tetrahydrofuran 30 parts by weight Toluene 10 parts by weight <Adhesive coating> Polyester resin 40 parts by weight Toluene 40 parts by weight 40 parts by weight of methyl ethyl ketone

Example 2 Transparent PEN having a thickness of 3.0 μm
A thermosensitive recording coating composed of an electron-donating color-forming compound and an electron-accepting compound dispersed in a resin base material was applied to a plastic film 1 made of a film by a gravure method at a drying temperature of 110 ° C. and a coating thickness of 10 μm. . In this upper layer,
The adhesive paint used in Example 1 was applied by a gravure method at a drying temperature of 100 ° C. and an applied thickness of 2 μm to obtain a reversible thermosensitive recording section. This reversible thermosensitive recording section was integrated with a previously prepared card support 7 made of a white PVC sheet having a total thickness of 760 μm having a three-layer structure by a hot press method at a temperature of 120 ° C. and a press pressure of 100 kg / cm ^2. Thus, an information recording medium was obtained.

The obtained information recording medium can be printed at an applied energy of 0.5 mJ / dot using a thermal head, and the print data is erased at an applied energy of 0.3 mJ / dot using a thermal head. did it. Further, the number of times of repetitive printing was 100 or more, and an information recording medium having high practicality was obtained. The paints used for card production are shown below. <Heat-sensitive recording layer coating> Crystal violet lactone 10 parts by weight 2- (3,5-di-t-amyl-2-hydro 10 parts by weight xylphenyl) benzotriazole bisphenolacetic acid and 40 parts by weight Salt of stearylamine 40 parts by weight stearamide Parts methacrylic resin 30 parts by weight toluene 500 parts by weight

Example 3 Transparent PEN having a thickness of 2.5 μm
On a plastic film 1 made of a film, the heat-sensitive recording paint used in Example 1 above, which is made of a low-molecular organic compound dispersed in a resin base material, is dried at a drying temperature of 13 using a gravure method.
The coating was performed at 0 ° C. and a coating thickness of 9 μm. On this upper layer, an Al layer having a thickness of 0.05 μm was provided as a coloring layer used in Example 1 by a vacuum evaporation method. Furthermore, in this upper layer,
The adhesive paint used in Example 1 was applied by a gravure method to a drying temperature of 100 ° C. and a coating thickness of 2 μm. On the back side of the plastic film 1 on which the heat-sensitive recording layer is provided, a heat-resistant lubricating coating material is dried at a drying temperature of 1 using a gravure method.
Coating was performed at 20 ° C. and a coating thickness of 0.5 μm to obtain a reversible thermosensitive recording section. This reversible thermosensitive recording section is prepared by using a prepared 3
A card support 7 made of a white PVC sheet having a total thickness of 760 μm and having a layer structure was heated at a temperature of 120 by a hot press method.
C. and a pressure of 100 kg / cm ² to obtain an information recording medium.

The obtained information recording medium can be printed with an applied energy of 0.4 mJ / dot using a thermal head, and the print data is erased with an applied energy of 0.2 mJ / dot using a thermal head. did it. Further, the number of times of repetitive printing was 100 or more, and an information recording medium having high practicality was obtained. The paints used for card production are shown below. <Heat-resistant lubricating paint> Acrylic resin 50 parts by weight Teflon filler 1.5 parts by weight Calcium carbonate 1.5 parts by weight Toluene 100 parts by weight Methyl ethyl ketone 100 parts by weight

Example 4 Transparent PET having a thickness of 2.5 μm
A 0.04 μm-thick TiO ₂ layer was formed on the plastic film 1 as a film by using a sputtering method as an inorganic vapor-deposited thin film layer in order to improve the resistance of the heat-sensitive recording layer. On this upper layer, a heat-sensitive recording paint composed of the electron-donating color-forming compound and the electron-accepting compound used in Example 2 dispersed in a resin base material was applied by a gravure method at a drying temperature of 110 ° C. It was applied at a thickness of 10 μm. further,
The adhesive coating used in Example 1 was applied to the upper layer by a gravure method at a drying temperature of 100 ° C. and a coating thickness of 2 μm to obtain a reversible thermosensitive recording section. This reversible thermosensitive recording section
An IC chip that can be integrated with a previously prepared card support 7 made of a white PVC sheet having a total thickness of 760 μm and having a total thickness of 760 μm by a hot press method at a temperature of 120 ° C. and a press pressure of 100 kg / cm ² to further record information. In order to provide an information recording medium, a recess was provided at a predetermined position of the card, and an IC chip was provided at this portion via an adhesive.

The obtained information recording medium can be printed at an applied energy of 0.5 mJ / dot using a thermal head, and further, the print data is erased at an applied energy of 0.3 mJ / dot using a thermal head. did it. Further, the number of times of repetitive printing was 100 or more, and an information recording medium having high practicality was obtained.

[0043]

According to the information recording medium of the present invention, the advantage of contrast of the high molecular weight / low molecular weight type or the leuco compound type is utilized, the number of times of repetitive printing is remarkably improved as compared with the conventional one, and furthermore, the water resistance, A configuration having improved resistance such as chemical resistance was obtained. Further, with respect to the print erasing characteristics, various excellent effects such as high quality print erasing can be achieved without any difference from the protective layer provided by the conventional coating method.

[Brief description of the drawings]

FIG. 1 is a sectional view of an information recording medium according to an embodiment of the present invention.

FIG. 2 is a sectional view of an information recording medium according to another embodiment of the present invention.

FIG. 3 is a sectional view of an information recording medium according to another embodiment of the present invention.

FIG. 4 is a sectional view of an information recording medium according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Plastic film 2 ... Heat-sensitive recording layer 3 ... Coloring layer 4 ... Adhesive 5 ... Heat-resistant lubricating layer 6 ... Inorganic vapor deposition thin film layer 7 ... Card support 8 ... Information recording section 9 …… Information recording medium (card)

Claims (8)

[Claims] 1. A card having a heat-sensitive recording layer provided on a support of a plastic sheet, wherein a transparent plastic film having a thickness of 1 to 10 μm is provided on the outer layer surface of the heat-sensitive recording layer. Information recording medium. 2. The information recording medium according to claim 1, wherein a reversible thermosensitive recording material is dispersed in a resin base material of the thermosensitive recording layer provided on the support of the plastic sheet to form a reversible thermosensitive recording layer. The information recording medium according to claim 1, wherein 3. The information recording medium according to claim 1, wherein
A heat-sensitive recording layer is provided on a transparent plastic film having a thickness of 100 µm, and the film is laminated on a support of a plastic sheet having a thickness of 100 to 1000 µm with the heat-sensitive recording layers facing each other. 3. The information recording medium according to 1 or 2. 4. The information recording medium according to claim 1, wherein an inorganic vapor-deposited thin film layer is provided on at least one surface of the transparent plastic film on the outer layer surface.
An information recording medium according to claim 1. 5. The information recording medium according to claim 1, wherein a resin layer having heat resistance and slipperiness is provided on the outermost layer surface of the transparent plastic film on the outer layer surface. 4. The information recording medium according to 4. 6. The information recording medium according to claim 1, wherein the reversible thermosensitive recording material provided on the thermosensitive recording layer comprises a resin base material and an organic low molecular weight dispersed in the resin base material. Layer and a thickness of 100
6. The information recording medium according to claim 1, wherein the information recording medium is laminated on a support of a plastic sheet having a thickness of up to 1000 [mu] m. 7. The information recording medium, wherein the reversible thermosensitive recording material provided in the thermosensitive recording layer comprises a reversible thermochromic composition of a leuco compound and a color-reducing agent, and a binder. 6. The information recording medium according to claim 1, wherein the information recording medium is laminated on a plastic sheet support having a thickness of 100 to 1000 [mu] m by an agent layer. 8. An information recording unit for managing image data recorded on a heat-sensitive recording layer in the information recording medium,
3. The device according to claim 1, wherein the two cards are provided in the same card.
The information recording medium according to 3, 4, 5, 6, or 7.